Mold for concrete flooring members.



J. G. ZWICKER.

MOLD PGR OONORETE FLOORING MEMBERS.

APPLIOATION IILBD JULY 9,1910.

Patented 001;. 31, 1911.

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UNITED STAIFlS JULIUS Gr. ZWICKER,

OF MEXICO, MEXICO.

MOLD FOR CONCRETE FLOORING MEMBERS.

Application tiled July 9,

To all whom t may concern:

Be it known that I, JULIUS Go'rLon Zwlolimz, citizen. of the United States, residin at No. 102 Paseo de la Reforma, city of exico, Mexico, have invented certain new and useful Improvements in Molds for Concrete Flooring Members, of which the following is a specification.

My invention relates to molds which may be used for making any known type of concrete flooring members, when suitably modifled in accordance with the particular shape and design of the member to be molded, but in the forni hereinafter described and illustrated it is particularly adapted for molding the flooring members of improved and special design .which `form the subject of my U. S. atent-application now pending, entitled Improvements in concrete oor and roof construction, Ser. No. 571,232, filed July 9, 1910.

The invention aims to produce a mold of simple and inex nsive design, of the knockdown type, lig t, readily assembled, and

readily stripped from the completed piece 1n such a way that the still impressiona le outer surfaces will not be marred in the d1smounting of the mold nor the internal partitions of the member be canted or distorted.

The construction is illustra-ted in the accompanying drawing, in which:

Figure 1 is a top plan view of the mold filled with cement and closed; Fig. 2, an end view of the mold; Fi 3, a vertical crosssection through the mo d, showin the upper mold filled with concrete in a p astic state, bein formed, superimposed on a flooring mem er fully formed, the material of which is undergoing further hardening Within the mold in whlch it was made, this resting on aA third member that has reached a more advanced stage of hardening Within its mold; Fig. 4, a vertical, longitudinal section through the mold, with the centering and locking bar shown in longitudinal ele Specication of Letters Patent.

Patented Oct. 31, 1911.

1910. serial No. 571,230.

i ably made of corrugated pressed steel, the

corrugations being shallow. They are made each 1n one piece for a standard length of floor member bound at either end by a removable wall locked to the side-Walls by ears 2, secured by keys 3. An outwardly projecting ledge 4 runs along the upper edge of each side-wall, enablin to be grasped for handling, w ile at the same time stilening the sheet. Side-walls 1 :1re set upon the bottom plate 5 of the mold, the foot abutting against upwardly projecting short ledges or lu s 6, which determine the width of the floorlng-member. The bottom plate has two short outer straight portions 5a correspondin in width to the thickness of the top' and tie bottom-walls of the floor member at its open side. Between portions 5 the middle port-ion is dished downwardly, forming at its two junctions with theouter parts the shoulders 5", which produce in the flooring member the offsets or shoulders b'y means of which said members interlock.

The outermost edges of the bottom plate are cut back for a short distance by a series of cuts leaving tongues of suitable width, say 2 inches. Of these every alternate one is bent upward forming the row of laterally retaining lugs 6, .while those intermediate are bent downward forming the series of lugs 5. As the flooring-members are preferably molded in stacks of three or more, when one is completed and the bottom plate of the succeeding one is placed upon it, these lu 5 rip the edges of the side-walls, ho ding t e latter in place against spreading when the stress of weight of the succeeding flooring members comes upon it. End-walls 7, preferably of pressed steel, having an outwardly bearing flange 7 at the upper end, keep the side-walls apart at the proper distance and prevent them from spreading. They are held in place by ears 2 projecting be. ond the side-walls secured t-o the end-wall y rivets 2 or similar suitable -means, locked outside the side-wall by keys 3, and form the ends of the mold frame, but not of the mold proper, excepting in cases at right angles to the sides. As the articular members for which this mold 1s primarily designed do not have straight ends, the special shapes must be produced by the insertion of auxiliary end-walls of suitable contour 8, 9. These are preferably made of the piece where the flooring-member has straight ends t correspondingly bent pressed steel, the edges 8il having a wavy or sinusoidal profile to lit the corrugations in the side-walls. 'lhey are entered between the side-walls and pushed to the place required to make the necessary length of member, where they are kept from moving toward the end under the pressure of the concrete by removable distance blocks 1() of apposite length abut4 ting against the lixed end-walls 7 of the frame. In order to make the top and bot tom surfaces of the ooring-nieinber pei'- fectly smooth flat sheet metal liners 1l may be placed on the inside of each side-wall covering the co-rrugations. These are shown in dotted lines in Fig. 2, having the upper edge bent to hook over the top edge of sidewalls with a close tit. In Fig. 5 auxiliary end-wall 8 shows the form used for moldingl the special floor-member described in'the application above referred to, and auxiliary end-Wall 9 shows the form which shapes the ends of Hoor-members adapted to rest upon reinforced concrete beams.

To make the internal partitions connecting the top and bottom walls of the flooringmember, I provide core-pots 11, preferably of pressed steel, the exterior surface 'of which exactly corresponds to the interior surface of one of the hollow spaces in the ooring-member, having its sides Haring slightly. After the mold has been assembled as above described, and locked by keys 3, concrete in a semi-liquid plastic condition is poured in to the level :f2-, Fig, 3, corres ending to the thickness of the closed side o the flooring-member. While theconcrete mixture is still plastic, the core-ptitsthere being two in this ease-are set upon the concrete. The thickness of the partition is determined by the distance, at which the cores are set apart longitudinally and the thickness of the end-Walls of the fiooringmember is determined by the distance 13 between the side .of the core-pot and the end-Wall of the mold. A centering plate 14 is set in the mouth of each core-pot accuratel fitting its sides. This plate is secured by bolts and nuts 15 to the two flanges of a T-iron centering bar 16, which carries at each end iron cross-pieces 17 bolted to it, cut to just t in between the two side-Walls and close to end-Walls 7. As the bar is bolted to the middle point to each crossieee, and of each centering plate, it must Insure that the core-pots cannot move out of the center laterally, nor diminish or increase the width of the internal partition of the flooring-members by moving longi tudinally under the effect of the iii-pouring cement. Ilaving placed the cores, the mold is now lilled to the edges with plastic concrete, reinforcing bars 18 being placed in the mass wherever desired. When this has become suiiieiently set., the centering bar with its plates and crosspieces is lifted out, the cores are removed, and a plate 5 is placed on its top, forming the base for another mold to be filled, the intention being to mold three or more members in each stack. After the concrete has become thoroughly set the keys 3 are. drawn, the sideand end-walls are taken down and the floormember is lifted olf from the bottom-plate of the mold, leaving the parts of the moldready to be assembled, in order to shape another flooring-member.

rlhroughout the specification the material used for making the {touring-members has been spoken of as concrete. While this is the substance most commonly used, the same mold will answer just as well for cement, or any clayey or earthy material which when mixed with water while ina colnminuted form produces a plastic amorphous mass which becomes hard and tenacious after drying.

Having thus described my invention what I claim as new and desire to have protected by Letters Patent is the following:

1. A mold for plastic flooring members having a bottom plate, retaining lugs carried by the longitudinal edges' of said bottom plate, said lugs projecting upwardly and downwardly and arranged in alternate relation, removable side plates supported by said bottom plates, removable end Walls connected to said side plates, auxiliary end walls between the first mentioned Wall and removable means for temporarily Securing said auxiliary end walls' longitudinally against outward movement.

2. A mold for plastic fiooring members comprising a bottom plate, removable side plates supported thereby, removable end walls for said mold, means for holding said end walls in position, core-pots, adjustable in said mold, a centering plate in each of said core-pots, a bar extendin transversely of said plates and secured thereto, and a cross piece at each end of said bar adapted to lit between said side plates adjacent said end walls.

In testimony whereof I have aiixed my signature in presence of two Witnesses.

JULIUS G. ZWICKER.

G. A. GUERRA.

Ooples of this patent may be obtained for ave cents each, by addressing the Commissioner of Patents Washington, D. C. 

